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?? ..
?? __init__.py(1.62 KB)
?? __pycache__
?? _asyncbackend.py(2.34 KB)
?? _asyncio_backend.py(8.84 KB)
?? _ddr.py(5.12 KB)
?? _features.py(2.43 KB)
?? _immutable_ctx.py(2.4 KB)
?? _trio_backend.py(8.27 KB)
?? asyncbackend.py(2.73 KB)
?? asyncquery.py(30.1 KB)
?? asyncresolver.py(17.43 KB)
?? dnssec.py(40.74 KB)
?? dnssecalgs
?? dnssectypes.py(1.76 KB)
?? e164.py(3.88 KB)
?? edns.py(16.69 KB)
?? entropy.py(4.14 KB)
?? enum.py(3.6 KB)
?? exception.py(5.81 KB)
?? flags.py(2.69 KB)
?? grange.py(2.09 KB)
?? immutable.py(1.97 KB)
?? inet.py(5.64 KB)
?? ipv4.py(2.49 KB)
?? ipv6.py(6.4 KB)
?? message.py(66.59 KB)
?? name.py(41.78 KB)
?? namedict.py(3.91 KB)
?? nameserver.py(9.88 KB)
?? node.py(12.37 KB)
?? opcode.py(2.67 KB)
?? py.typed(0 B)
?? query.py(54.98 KB)
?? quic
?? rcode.py(4.06 KB)
?? rdata.py(30.29 KB)
?? rdataclass.py(2.91 KB)
?? rdataset.py(16.27 KB)
?? rdatatype.py(7.27 KB)
?? rdtypes
?? renderer.py(10.99 KB)
?? resolver.py(72 KB)
?? reversename.py(3.74 KB)
?? rrset.py(8.96 KB)
?? serial.py(3.52 KB)
?? set.py(9 KB)
?? tokenizer.py(23.03 KB)
?? transaction.py(22.06 KB)
?? tsig.py(11.15 KB)
?? tsigkeyring.py(2.57 KB)
?? ttl.py(2.91 KB)
?? update.py(11.96 KB)
?? version.py(1.88 KB)
?? versioned.py(11.49 KB)
?? win32util.py(8.67 KB)
?? wire.py(2.76 KB)
?? xfr.py(12.96 KB)
?? zone.py(50.87 KB)
?? zonefile.py(27.27 KB)
?? zonetypes.py(690 B)

Editing: reversename.py

# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license

# Copyright (C) 2006-2017 Nominum, Inc.
#
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose with or without fee is hereby granted,
# provided that the above copyright notice and this permission notice
# appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

"""DNS Reverse Map Names."""

import binascii

import dns.ipv4
import dns.ipv6
import dns.name

ipv4_reverse_domain = dns.name.from_text("in-addr.arpa.")
ipv6_reverse_domain = dns.name.from_text("ip6.arpa.")

def from_address(
    text: str,
    v4_origin: dns.name.Name = ipv4_reverse_domain,
    v6_origin: dns.name.Name = ipv6_reverse_domain,
) -> dns.name.Name:
    """Convert an IPv4 or IPv6 address in textual form into a Name object whose
    value is the reverse-map domain name of the address.

*text*, a ``str``, is an IPv4 or IPv6 address in textual form
    (e.g. '127.0.0.1', '::1')

*v4_origin*, a ``dns.name.Name`` to append to the labels corresponding to
    the address if the address is an IPv4 address, instead of the default
    (in-addr.arpa.)

*v6_origin*, a ``dns.name.Name`` to append to the labels corresponding to
    the address if the address is an IPv6 address, instead of the default
    (ip6.arpa.)

Raises ``dns.exception.SyntaxError`` if the address is badly formed.

Returns a ``dns.name.Name``.
    """

try:
        v6 = dns.ipv6.inet_aton(text)
        if dns.ipv6.is_mapped(v6):
            parts = ["%d" % byte for byte in v6[12:]]
            origin = v4_origin
        else:
            parts = [x for x in str(binascii.hexlify(v6).decode())]
            origin = v6_origin
    except Exception:
        parts = ["%d" % byte for byte in dns.ipv4.inet_aton(text)]
        origin = v4_origin
    return dns.name.from_text(".".join(reversed(parts)), origin=origin)

def to_address(
    name: dns.name.Name,
    v4_origin: dns.name.Name = ipv4_reverse_domain,
    v6_origin: dns.name.Name = ipv6_reverse_domain,
) -> str:
    """Convert a reverse map domain name into textual address form.

*name*, a ``dns.name.Name``, an IPv4 or IPv6 address in reverse-map name
    form.

*v4_origin*, a ``dns.name.Name`` representing the top-level domain for
    IPv4 addresses, instead of the default (in-addr.arpa.)

*v6_origin*, a ``dns.name.Name`` representing the top-level domain for
    IPv4 addresses, instead of the default (ip6.arpa.)

Raises ``dns.exception.SyntaxError`` if the name does not have a
    reverse-map form.

Returns a ``str``.
    """

if name.is_subdomain(v4_origin):
        name = name.relativize(v4_origin)
        text = b".".join(reversed(name.labels))
        # run through inet_ntoa() to check syntax and make pretty.
        return dns.ipv4.inet_ntoa(dns.ipv4.inet_aton(text))
    elif name.is_subdomain(v6_origin):
        name = name.relativize(v6_origin)
        labels = list(reversed(name.labels))
        parts = []
        for i in range(0, len(labels), 4):
            parts.append(b"".join(labels[i : i + 4]))
        text = b":".join(parts)
        # run through inet_ntoa() to check syntax and make pretty.
        return dns.ipv6.inet_ntoa(dns.ipv6.inet_aton(text))
    else:
        raise dns.exception.SyntaxError("unknown reverse-map address family")

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